Ok I found it with Regshot 1.8.1 (I could not find an easy way with Regmon since it listed hundreds of registry queries, Regshot allowed me to take a snap shot before and after the changes and then compared the two and lasted listed deletions and modifications, very nice. tool!) When the browse in same window option is unchecked this key is added: HKLM\SOFTWARE\Classes\Word.Document.8\BrowserFlags: 0x00000008 I also want to set the "confirm open after download" option. Unchecking this option changes the following key: from this: HKLM\SOFTWARE\Classes\Word.Document.8\EditFlags: 0x00000000 to this: HKLM\SOFTWARE\Classes\Word.Document.8\EditFlags: 0x00010000 so how do I create an adm template to push this setting out through a GPO?